igmp timer other-querier-present
Function
The igmp timer other-querier-present command configures the Keepalive period of the other IGMP queriers.
The undo igmp timer other-querier-present command restores the default configuration.
Parameters
| Parameter | Description | Value |
|---|---|---|
| interval | Specifies the Keepalive period of the other IGMP queriers. | The value is an integer ranging from 60 to 300, in seconds. |
Usage Guidelines
By default, the formula used to calculate the Keepalive period of the other queriers is: the Keepalive period of the other IGMP queriers = robustness variable x the interval for sending IGMP general query messages + 1/2 x maximum response time. When default values of robustness variable, the interval for sending IGMP general query messages, and maximum response time are used, the Keepalive period of the other IGMP queriers is 125 seconds.
If multiple multicast routers are connected to a network segment, IGMP chooses one of the FWs as the querier. The querier is responsible for periodically sending query messages to the network segment. If the non-querier FWs do not receive any query message within the Keepalive period of other IGMP queriers, the querier is considered invalid and the querier election is automatically triggered.
In IGMPv1, the querier selection is determined by the multicast routing protocol. In IGMPv2 and IGMPv3, the FW with the lowest IP address on the shared network segment acts as the querier.
You must run the multicast routing-enable command to enable the multicast function before using the command.
If the Keepalive period of other queriers is shorter than the interval for sending IGMP general query messages, the querier on the network changes repeatedly.
The function of this command is the same as that of the timer other-querier-present used in the IGMP view, except for the function range. The configuration in the IGMP view is globally valid in the instance, whereas the configuration in the interface view is valid only for the current interface. The system prefers the configuration in the system view. The configuration in the IGMP view is used only when the configuration in the interface view is not done.